19GQ7 is a vacuum tube, also known as a thermionic valve, used in various electronics applications. It is an all glass, small signal triple diode triode which is used in many consumer electronics. It is a type of diode-triode which incorporates three separate cathode and anode elements, designed to be self-contained, and able to offer two modes of operation: one as an amplifier, and another as a high-speed switching device. Its maximum plate voltage is 75 volts, and its maximum peak inverse voltage is 100 volts. It is commonly used in amplifiers, preamplifiers, equalizers, and other high-end audio and video electronics.